Highly productive — marks characters about ritual, ancestral spirits, blessings, and omens. The full form 示 sits at the bottom (祭 sacrifice, 票 ticket, originally a fluttering omen). The slim left-side variant 礻 (示字旁) drives the everyday compounds: 神, 礼, 福, 祝, 祖, 社, 祸. Strong meaning clue.